Solve : Calculate the atomic mass of copper if copper has two isotopes . 69.1% has a mass of 62.93 amu and the rest has a mass of 64.93 amu.

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

Ithink the answer is d.